Oracle Java SE/GraalVM for JDK/GraalVM Enterprise Edition denial of service

Summaryinfo

A vulnerability identified as problematic has been detected in Oracle Java SE, GraalVM for JDK and GraalVM Enterprise Edition. This impacts an unknown function. This manipulation causes denial of service. This vulnerability appears as CVE-2026-21945. The attack may be initiated remotely. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Oracle Java SE, GraalVM for JDK and GraalVM Enterprise Edition (affected version not known). It has been declared as problematic. Affected by this vulnerability is some unknown functionality. The manipulation with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect availability. The summary by CVE is:

Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: Security). Supported versions that are affected are Oracle Java SE: 8u471, 8u471-b50, 8u471-perf, 11.0.29, 17.0.17, 21.0.9, 25.0.1; Oracle GraalVM for JDK: 17.0.17 and 21.0.9; Oracle GraalVM Enterprise Edition: 21.3.16. Easily exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition. Note: This vulnerability applies to Java deployments, typically in clients running sandboxed Java Web Start applications or sandboxed Java applets, that load and run untrusted code (e.g., code that comes from the internet) and rely on the Java sandbox for security. This vulnerability does not apply to Java deployments, typically in servers, that load and run only trusted code (e.g., code installed by an administrator). CVSS 3.1 Base Score 7.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

It is possible to read the advisory at oracle.com. This vulnerability is known as CVE-2026-21945 since 01/05/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 294870 (Oracle Java SE Multiple Vulnerabilities (January 2026 CPU)), which helps to determine the existence of the flaw in a target environment.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (294870), EUVD (EUVD-2026-3564) and CERT Bund (WID-SEC-2026-0164). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

• IBM Java SDK
• Debian Linux
• IBM Tivoli Monitoring
• Amazon Linux 2
• IBM Power Hardware Management Console
• Open Source OpenJDK
• Red Hat Enterprise Linux
• Ubuntu Linux
• IBM WebSphere Application Server
• SUSE Linux
• IBM Tivoli Netcool/OMNIbus
• Oracle Linux
• IBM Tivoli Business Service Manager
• IBM TXSeries
• IBM License Metric Tool
• Hitachi Ops Center
• Hitachi Configuration Manager
• IBM MQ
• Dell Data Protection Advisor
• IBM Rational Business Developer
• SUSE openSUSE
• RESF Rocky Linux
• IBM App Connect Enterprise
• IBM InfoSphere Information Server
• Azul Zulu
• Hitachi Command Suite
• IBM Sterling Connect:Direct
• IBM WebSphere Service Registry and Repository
• Oracle Java SE
• Oracle GraalVM
• Amazon Corretto
• Tenable Security Nessus Network Monitor
• IBM Integration Bus
• Dell NetWorker
• Dell Secure Connect Gateway
• IBM DataPower Gateway
• IBM Semeru Runtime
• Dell ECS

Productinfo

Type

• Programming Language Software

Vendor

• Oracle

Name

• GraalVM Enterprise Edition
• GraalVM for JDK
• Java SE

License

• open-source

Website

• Vendor: https://www.oracle.com

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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